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US 7,679,540 B2Granted
Double sampling DAC and integrator
AssigneeInfineon Technologies AG
InventorsJose Luis Ceballos, Michael Kropfitsch
Life of this patent
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Abstract
This disclosure relates to systems and methods for analog to digital conversion using delta sigma modulation. To this end, the delta sigma modulator includes a double sampling DAC and integrator and a 1-bit comparator, with reference loading insensitivity.
Claims20
An apparatus comprising:
- an analog to digital converter (ADC) that samples and quantizes an analog signal to a digital signal comprised of:
- a doubling sampling digital to analog converter (DAC) and integrator that receives and amplitude multiplies the analog signal using cross-coupled sampling capacitors to reduce flicker noise, wherein the cross-coupled sampling capacitors are charged during a first clock cycle by at least one of a positive and a negative voltage references from a feedback signal, and discharged during a second clock cycle to provide a maximum transfer charge that is proportional to at least twice of analog signal voltage change;
- and
- a 1-bit comparator that receives an output from the double sampling digital to analog converter (DAC), and generates the digital signal;
- and
- a modulator that modulates the digital signal.
3 more elements
A double sampling digital to analog converter (DAC) and integrator comprising:
- an operational amplifier which operates as a fully differential integrator, and receives an analog input signal;
- wherein the operational amplifier amplitude multiplies the analog input signal using cross-coupled sampling capacitors to reduce flicker noise, wherein the cross-coupled sampling capacitors are charged during a first phase by at least one of a positive and a negative voltage references in a feedback signal, and discharged during a second phase to provide a maximum transfer charge that is proportional to at least twice of analog input signal voltage change;
- two or more sampling capacitors that sample the analog input signal;
- and
- multiple switches that determine sampling state of the two or more sampling capacitors.
2 more elements
A method of converting an analog signal to a digital signal comprising:
- receiving the analog signal;
- charging one or more capacitors to a voltage value associated with the analog signal and reference voltages from a feedback signal;
- discharging the one or more capacitors;
- charging one or more integrating capacitors upon the discharging;
- and
- generating a fully differential sampled signal that is amplitude multiplied using cross-coupled sampling capacitors to reduce flicker noise, based on the charging of the one or more integrating capacitors.
3 more elements
Dependencies are inferred from the claim text.